Sorry Rich, the replies here are hit and miss. I am looking for the exact same thing as you, only for around $8000... I think that should be around 80k. Who knows, I'll keep you posted. You can use Kelly Blue book, but honestly, I got find what I want on ebay and add then all to my watch list. Then I see what they sell for at close. If you want a local sale, I would add maybe $1k-1.5k to that.
Hope that gives you some good ideas. And happy hunting, just don't buy my Jeep! The forums here, sometimes you will get nothing. Other times you get gold, so it is usually worth it, but you have to be willing to have a few empty posts.
Great XJ Troubleshooting/mod sites list: http://myriad360.x10hosting.com/blog/?cat=9
2001 Jeep Cherokee 4.0 L Limited, White. Bought in Grangeville, ID 06/11/08. Stock everything.
1998 Jeep Wrangle 4.0 L, Green. Bought in Nampa, ID 02/21/09
1988 Jeep Cherokee 4.0 L, White. Bought in Vancouver, WA in 2003. 1st Jeep, White. Bought with 3" lift, added Pacesetter header and 40 series Flowmaster